Centrator



(No Model.) 2 SheetsPSheet 1'.

R. STLNPIELD &- T. OLARKSON.

CBNTRIFUGAL SEPARATING MACHINE.

No. 459,315. Patented Sept, 8, 1891;

(No Model.) 7 2 Sheets-Sheet 2. R. STANFIELD 8: T. OLARKSON.

GENTRIPUGAL SEPARATING MACHINE.

No. 459315. Patented Sept. 8, 18 91.

UNITED STATES PATENT OFFICE,

RICHARD sTANEIELD,1OI EDINBURGH, scorLAND, AND THOMAS OLARKSON,

OF LONDON, ENGLAND, AssIcNORs TO THE oLARKsONsTANEIELD oON- CENTRATOR,LIMITED, OF LONDON, ENGLAND.

CENTRIFUGAL SEPARATlNG-MACHINE.

' SPECIFICATION forming part of Letters Patent No. 459,315, datedSeptember 8, 1891.

Application filed May 27, 1890. Serial No. 358.365. (No model.) Patentedin England January 17. 1889, N0. 890.

To all whom it may concern:

Be itknown that we, RICHARD STANEIELD, of HeriotlVatt College,Edinburgh, Scotland, and THOMAS CLARKSON, of Kings College, London,England, subjects of the Queen Of Great Britain, have invented certainnew and useful Improvements in Centrifugal Separating- Machines, (forwhich we have obtained a patent in Great Britain, No. 890, dated JanuaryI0 17, 1889,) of which the following is a full, clear,

and exact specification.

This invention has for its object to provide a novel, simple, andefficient machine for separating metals, heavy minerals, and other densebodies from their lighter associated Ores or materials.

Our improved apparatus comprises a centrally-mounted centrifugal vesselof special shape for the purposes hereinafter set forth and adapted toreceive the materials to betreated. It is provided with a number ofspecially-constructed long, narrow, parallelsided radial apertures, eachof sectional area only slightly larger than the particles to be treated,so as to allow free passage, and extending from the interior to theexterior of the vessel, and through which the material is ejected bycentrifugal force and by which its velocity of projection is maintainedpractically constant. The improved centrifugal vessel is provided withmeans for driving it, and is combined with a dust-excluding cover forworking parts, which may be rotary or not.

Our improved apparatus is also applicable for classifying according tosize those materials the particles of which are of the same specificgravity, the larger particles flying farthest away because of theirgreater mass; but where the particles of any material are not of thesame specific gravity they may first be classified according to size bythe usual screening processes and then passed through the machine, whenthey will be separated according to specific gravity.

The improvements will be hereinafter described in detail andspecifically set forth in the claims, reference being made to theaccompanying drawings, in which- Figure 1 is a sectional elevation ofthe machine, showing driving-gear in elevation. Fig. 2 is a sectionalplan on line X Y, Fig. 1. Fig. 3 is a part sectional plan of thespeciallyformed radial apertures, and Fig. 4 is an en larged partsection thereof.

In the drawings, the letter A indioates the centrifugal vessel intowhich the pulverized material is fed, and it is of the form shown inFig. ]that is, expanded at both its upper and lower ends and contractedabout the center. The expanded lower end is provided with a number oflong narrow radial apertures a, through which the material is ejected.Referring to Figs. 3 and 4, these apertures a are made long inproportion to the diameter or sectional area. They are illustrated asstraight and horizontal; but they may be curved and disposed to projectthe material horizontally or upward or downward at any desired angle. Incross-section they may be square, rectangular, or round; but althoughradially arranged they are parallel-sided for the whole of their length,except the inner ends, where the walls between them are beveled Off bothvertically and horizontally, as shown, to facilitate entry of material.The vessel A may have one or more rows of such apertures a, and is madein two parts fixed together, the lower part beingasolid disk A, fixedcentrally to the head of the spindle B and constructed with a centralswell A Fig. 1. The joint is made as shown, orit may be horizontallythrough the apertures to facilitate the attachment of duplicate vesselssuitable for the particular material to be treated and the cleaning ofthe apertures. Thus a number of upper parts A, with apertures ofdifferent size, form, or n umber, may form part of each machine.

The object of this peculiar form of vessel described is as follows:Since the feed of 0 granulated materialsis vertical and the direction oftheir projection horizontal, or thereabout, and since it is undesirableto further break up the materials by violent concussions, it isnecessary to make the change of 5 direction of motion as gradual aspossible. Hence the curved and expanded form of the lower end of vesselA and the swell A on the center of the solid base-disk A. The expansionof the lower end also enables a greater number of radial apertures to beemployed, thus increasing the efficiency of the apparatus. The object ofcontracting the middle part, as illustrated in Fig. 1, is to inclose thevessel as completely as possible and prevent the materials flying out atthe top. The

shaft B may be driven from a shaft by bevel-wheels D and E or byordinary belt or rope gearing. The spindle B is mounted in bearings Fand G in the mainframe H. The bearing F is protected from dust by thecap I and by an external conical cover J. The cover J may be fixed; butin cases where it is required to use the well-known revolving brushesand annular receiver it is made to revolve, and this may be doneaccording to the improved means illustrated. The cover J rests onrollers K, centered in the main frame L. Lateral displacement of thecover J is prevented by bearings M N, and to exclude dust from the coverits top is sunk a little way into the flange A and overlaps the frame Lat Z. The cover J may be rotated by an internally-toothed wheel R andpinion S,

' fixed to a short spindle carried in a sleeve 15,"

directly or by feed-pipe X from hopper X, p

and the vessel is rotated at a speed as nearly constant as practicable,any suitable speedregulating apparatus being applied, if required. orcurved disk A of the centrifugal vessel A, and thus their direction ofmotion is gradually changed and they are directed into and ejectedthrough the apparatus a.

Apparatus constructed as above set forth i is applicable to thetreatment of ores of gold,

silver, tin, lead, copper, or any other metal.

It may be used for sizing purposes, or in conjunction with other sizingappliances for the purpose of separating metals and minerals from ores.

We would statethat we are aware that The particles fall onto the swelledv centrifugal apparatus for ore-separating and analogous purposes isknown; but the rotary part has, so far as we know, always consisted of adish-shaped receiver or cup or distributing-disk with simple lateralapertures or narrow slots or continuous circumferential vents in itssides; also, that arms horizontally projecting from a feed-tube havebeen tried; but

What we claim is- 1. In an ore separator or classifier, the combinationof the rotary spindle B, having at its upper end the attached solid diskA, provided at its center'with the upwardly-projectin g swell A with thevessel A rigidly secured to the disk and formed with the contractedupper portion and the expanded lower end having long narrow radialapertures, the bottom walls of which are formed by the solid disk,

substantially as described.

2. In an ore separator or classifier, the combination, with acentrally-mounted centrifugal vessel having apertures a and thedrivingshaft B, of a rotary'inclosing cover J, having dust-excludin gdevices, an internal gear-ring R, a pinion S, and a shaft 0 for rotatingthe pinion, substantially as described.

3. In an ore separator or classifier, the combination of the revolvingvessel A, formed with the expanded lower end provided with radialparallel-sided apertures a, a rotary shaft B, having an attached soliddisk A, provided with the raised or swelled center A which forms thebottom wall of the vessel, and the inclosing cover J, provided with thedustcap I, extending to the under side of the solid disk, substantiallyas described.

In testimony whereof we affix our signatures in the presence of twowitnesses.

RICHARD STANFIELD. THOMAS CLARKSON.

WVitnesses to the signature of Richard Stanfield:

HUGH (J. PEAOOCK, U. S. Vice- Consul, No. 8 York Buildings,

Edinburgh.

NEIL BROWNLEE, Clerk, U. S. (Ionsulate, No. 8 York Buildings,

Edinburgh. I

Witnesses to the signature of Thomas Clarkson:

J OSEPH C. CHAPMAN,

Patent Agent. HORACE J. BODDINGTON.

